Man, I get flats a lot. So I NEVER go out without my jack and spare. Actually, I have a full spare tire, so I can take out my doughnut tire. But yeah, the jack and doughtnut don't weigh much, so it wouldn't really affect your 1/4 mile time. Maybe if you replace your hood w/ carbon fiber, you can save yourself like 20 lbs. Getting rid of heavier parts and replacing them with plastic parts helps.

Nische